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Astoria Marine Construction Company

Site summary

The Astoria Marine Construction Company, or AMCCO, site is contaminated with hazardous chemicals from historical ship manufacturing and repair operations. Contamination is in soil on the property and in nearby riverbed sediment in the Lewis and Clark River near the mouth of the Columbia River.

In coordination with AMCCO, tribal governments, and a community advisory group, DEQ selected a remedy in 2017 to clean up contamination on the site and in the adjacent riverbed. AMCCO completed the cleanup under terms of a consent judgment with DEQ.

Status of the cleanup

AMCCO completed all major remedy construction activities during the spring and summer of 2020. These included preparation activities such as demolition of select onsite buildings and structures followed by excavation of contaminated sediments in marine ways and upland soil hot spot removal for offsite landfill disposal. In the summer of 2021, AMCCO restored the levee and constructed a stormwater management system. AMCCO completed upland capping in summer 2022.  Completion of the remedial action is documented in a Construction Completion Report. 

AMCCO's future requirements for inspection and maintenance of the upland cap, and implementation of contaminated media plan during any intrusive activities, will be memorialized in an Easement and Equitable Servitudes recorded on the property deed. AMCCO will maintain the upland cap, and DEQ will perform long-term monitoring and maintenance of the sediment caps using DEQ orphan program funds.

DEQ reviewed the requirements of the consent judgment and the corresponding actions and has made a preliminary determination that all obligations of the judgment have been satisfactorily performed, and that a Certification of Completion should be issued. DEQ further concludes that because all environmental concerns have been addressed, issuance of a Conditional No Further Action determination is warranted.

DEQ held a 30-day public comment period from Feb. 1, 2024, to March 4, 2024, to accept comments on its proposal to issue a Certification of Completion and Conditional No Further Action determination.  

Supporting documents, including the public notice, draft Certification of Completion, and draft Conditional No Further Action determination can be found in Your DEQ Online, Project Number: 1898.


Your DEQ Online Project Number: 1898

County:  Clatsop
City:  Astoria
Region: Northwest 


Project Manager: Erin McDonnell
Phone: 503-229-6900